Long-Term Variation of the Spin Period of a Magnetic Cataclysmic Variable, MU Camelopardalis

Details Long-Term Variation of the Spin Period of a Magnetic Cataclysmic Variable, MU Camelopardalis Long-Term Variation of the Spin Period of a Magnetic Cataclysmic Variable, MU Camelopardalis

Mar 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jass...28....9y&link_type=abstract

Journal of Astronomy and Space Sciences. Vol. 28, no. 1, p. 9-12

Astronomy and Astrophysics

Astronomy

Cataclysmic Variables, Intermediate Polar, Period Variation, O-C Diagram

Scientific paper

Results of an analysis of 11 nights of R-filter CCD photometry data of an intermediate polar MU Camelopardalis (MU Cam) obtained at the Korean 1.0 m telescope at Mt. Lemmon are reported. After checking the spin period with our data, Pspin =0.d01373801(59), we compiled the reported data of maxima timing and an O-C diagram analysis has been carried out to understand the spin period variation. A significant spin period variation was detected, and fitting the O-C points to a cubic parabola led to an ephemeris of BJDmax =2453682.4178(94)+ 0.0137380(13)E 2.07(55) ×10-11E 2+2.28(52)×10 -15E3. The torque experienced by the magnetic compact star accreting in a disk is estimated as τ ˜1.815×10^35gcm2 / s2 in a simple approximation in order to show how important monitoring the period variation is. Thus we conclude that monitoring the long-term spin period variation will help to understand the physical condition of magnetic compact stars.

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